/download path of the playground is returning a validation file that isn't valid

[miparnisari]

The /download path of the playground is returning a validation file that isn't valid. For example

https://play.authzed.com/s/iksdFvCtvnkR/download

returns (some lines omitted for brevity)

schema: |-
    definition user {}

    definition resource {
        relation manager: user | usergroup#member | usergroup#manager
        relation viewer: user | usergroup#member | usergroup#manager

        permission manage = manager
        permission view = viewer + manager
    }
   ... 
relationships: |-
    // Add users to various groups
    usergroup:productname#manager@user:an_eng_manager
    usergroup:productname#direct_member@user:an_engineer
    ...
validation: |
    organization:org1#admin:
      - "[user:ceo] is <usergroup:csuite#manager>"
      - "[user:cto] is <usergroup:csuite#direct_member>"
      ...
assertions: |
    assertTrue: []
    assertFalse: []

Notice the following: validation: | and assertions: |. This is incorrect - they are not strings.

I believe the issue is that this struct:

https://github.com/authzed/spicedb/blob/1de8a05f55f97268b047b59dba05f969757d7dbe/internal/services/v0/sharestore.go#L29-L37

doesn't have the right types.

The downstream effect of this is that zed validate <playground-url> doesn't work: authzed/zed#487

[tstirrat15]

We'll also need to make a change here, I think:

playground/src/services/validationfileformat.ts

Lines 32 to 54 in 7bc321f

	export const createValidationYAML = (datastore: DataStore): string => {
	const schema = datastore.getSingletonByKind(
	DataStoreItemKind.SCHEMA,
	).editableContents!;
	const relationships = datastore.getSingletonByKind(
	DataStoreItemKind.RELATIONSHIPS,
	).editableContents!;
	const assertions = datastore.getSingletonByKind(
	DataStoreItemKind.ASSERTIONS,
	).editableContents!;
	const expectedRelations = datastore.getSingletonByKind(
	DataStoreItemKind.EXPECTED_RELATIONS,
	).editableContents!;
	const parsed = {
	schema: schema,
	relationships: relationships,
	assertions: yaml.parse(assertions) as AssertionData,
	validation: yaml.parse(expectedRelations) as ValidationData,
	};
	return yaml.stringify(parsed, { lineWidth: 0 });
	};